mod_cron: Sync Teal source with 92301fa7a673
Yeah, it's weird to have two versions. Needing more build dependencies
is also something we want to avoid, so here we are.
For full information on our dependencies, version requirements, and
where to find them, see https://prosody.im/doc/depends
If you have luarocks available on your platform, install the following:
- luaexpat
- luasocket
- luafilesystem
- luasec